U.S. patent application number 15/772851 was filed with the patent office on 2018-11-08 for permanent magnet motor.
This patent application is currently assigned to Mitsubishi Electric Corporation. The applicant listed for this patent is Mitsubishi Electric Corporation. Invention is credited to Satoru AKUTSU, Yuji TAKIZAWA, Kentaro URIMOTO.
Application Number | 20180323686 15/772851 |
Document ID | / |
Family ID | 59089807 |
Filed Date | 2018-11-08 |
United States Patent
Application |
20180323686 |
Kind Code |
A1 |
TAKIZAWA; Yuji ; et
al. |
November 8, 2018 |
PERMANENT MAGNET MOTOR
Abstract
Provided is a permanent magnet motor including an armature, a
rotor, and an angle detector. The angle detector includes a sensor
magnet and a semiconductor sensor. The sensor magnet is magnetized
into two poles and is provided in an end portion of a rotation
shaft, and has the same rotation center as that of the rotation
shaft. The semiconductor sensor is opposed to the sensor magnet in
an extension direction of the rotation shaft. The semiconductor
sensor and the sensor magnet have a gap formed therebetween, and a
plate member made of a magnetic substance is provided between the
semiconductor sensor and an end portion of the armature iron core
on the semiconductor sensor side.
Inventors: |
TAKIZAWA; Yuji; (Tokyo,
JP) ; URIMOTO; Kentaro; (Tokyo, JP) ; AKUTSU;
Satoru; (Tokyo, JP) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Mitsubishi Electric Corporation |
Tokyo |
|
JP |
|
|
Assignee: |
Mitsubishi Electric
Corporation
Tokyo
JP
|
Family ID: |
59089807 |
Appl. No.: |
15/772851 |
Filed: |
December 25, 2015 |
PCT Filed: |
December 25, 2015 |
PCT NO: |
PCT/JP2015/086317 |
371 Date: |
May 2, 2018 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
H02K 1/16 20130101; H02K
3/12 20130101; H02K 11/215 20160101; H02K 1/276 20130101; H02K
29/03 20130101; H02K 11/01 20160101; H02K 11/33 20160101; H02K 3/28
20130101 |
International
Class: |
H02K 11/215 20060101
H02K011/215; H02K 1/16 20060101 H02K001/16; H02K 1/27 20060101
H02K001/27; H02K 3/12 20060101 H02K003/12; H02K 3/28 20060101
H02K003/28 |
Claims
1. A permanent magnet motor, comprising: an armature; a rotor; and
an angle detector, wherein the armature includes: an armature iron
core; and an armature winding, wherein the rotor includes: a rotor
iron core; and a permanent magnet wherein the angle detector
includes: a sensor magnet; and a semiconductor sensor, wherein the
rotor iron core including the permanent magnet is fixed to a
rotation shaft, wherein the sensor magnet is magnetized into two
poles and is provided in an end portion of the rotation shaft, and
has the same rotation center as a rotation center of the rotation
shaft, wherein the semiconductor sensor is opposed to the sensor
magnet in an extension direction of the rotation shaft; wherein the
semiconductor sensor and the sensor magnet have a gap formed
therebetween, and wherein a plate member made of a magnetic
substance is provided between the semiconductor sensor and an end
portion of the armature iron core on the semiconductor sensor
side.
2. A permanent magnet motor according to claim 1, wherein the
permanent magnet motor includes any one of a 10-pole and 12-slot
type magnet motor, a 14-pole and 12-slot type magnet motor, and a
14-pole and 18-slot type magnet motor.
3. A permanent magnet motor according to claim 1, wherein the
armature winding has six phases of U1, U2, V1, V2, W1, and W2 in
which phases of supply currents are the same between two phases of
each of sets of U1 and U2, V1 and V2, and W1 and W2.
4. A permanent magnet motor according to claim 1, wherein: the
permanent magnet motor includes any one of a 10-pole and 12-slot
type magnet motor and a 14-pole and 12-slot type magnet motor; the
armature winding has six phases of U1, U2, V1, V2, W1, and W2 in
which two phases of supply currents of each of sets of U1 and U2,
V1 and V2, and W1 and W2 have a phase difference of 30 degrees in
an electrical angle; and the permanent magnet motor is driven
through current supply only to three phases of U2, V2, and W2
different in a phase of the supply current by 120 degrees from one
another, without current supply to the other three phases.
5. A permanent magnet motor according to claim 1, wherein the
armature winding has six phases of U1, U2, V1, V2, W1, and W2 in
which the windings of the two phases of each of sets of U1 and U2,
V1 and V2, and W1 and W2 have the same number of turns, and are
stored in the same slot.
6. A permanent magnet motor according to claim 2, wherein the
armature winding has six phases of U1, U2, V1, V2, W1, and W2 in
which the windings of the two phases of each of sets of U1 and U2,
V1 and V2, and W1 and W2 have the same number of turns, and are
stored in the same slot.
7. A permanent magnet motor according to claim 3, wherein the
armature winding has six phases of U1, U2, V1, V2, W1, and W2 in
which the windings of the two phases of each of sets of U1 and U2,
V1 and V2, and W1 and W2 have the same number of turns, and are
stored in the same slot.
8. A permanent magnet motor according to claim 4, wherein the
armature winding has six phases of U1, U2, V1, V2, W1, and W2 in
which the windings of the two phases of each of sets of U1 and U2,
V1 and V2, and W1 and W2 have the same number of turns, and are
stored in the same slot.
Description
TECHNICAL FIELD
[0001] The present invention relates to a permanent magnet
motor.
BACKGROUND ART
[0002] For example, in Patent Literature 1, there is disclosed a
permanent magnet motor of a consequent pole type in which a sensor
magnet is arranged on an end of a rotation shaft, and an angle
detector including a semiconductor sensor of a magnetic resistance
type is provided so as to be opposed to the rotation shaft in an
axial direction. In this permanent magnet motor, it is intended to
arrange a magnetic flux inductor made of a soft magnetic substance
between a rotor of the consequent pole type and the semiconductor
sensor so as to increase an angle detection precision.
CITATION LIST
Patent Literature
[0003] [PTL 1] JP 2014-107973 A
SUMMARY OF INVENTION
Technical Problem
[0004] In the permanent magnet motor of the consequent pole type,
it is known that, in addition to a pseudo pole formed of a rotor
core opposed to a gap to the armature for a magnetic pole of the
permanent magnet opposed to the gap to the armature, there exists
such a problem that a rotation shaft, which is a magnetic substance
in contact with the rotor core, presents a polarity of an opposite
pole. The rotation shaft end itself to which the sensor magnet is
mounted serves as a magnet, and the angle detection precision is
thus decreased by a leakage magnetic flux leaking from the rotation
shaft end, and interlinking with the semiconductor sensor.
[0005] In the Patent Literature 1, it is intended to arrange the
magnetic flux inductor formed of the soft magnetic substance
between the rotor of the consequent pole type and the semiconductor
sensor to guide the leakage magnetic flux of the rotor unique to
the consequent pole so as to bypass the semiconductor sensor, to
thereby reduce the leakage magnetic flux from the rotor end.
[0006] Meanwhile, in the permanent magnet motor including
consequent poles, a magnetic flux generated by an armature winding
leaks from the armature and interlinks with the semiconductor
sensor, to thereby cause an armature leakage magnetic flux, which
decreases the angle detection precision. This armature leakage
magnetic flux flows from an outer periphery of the armature,
horizontally penetrates the semiconductor sensor on a plane
perpendicular to the rotation shaft, and flows into the outer
periphery of the armature on an opposite side. Therefore, when a
magnetic substance is arranged around the semiconductor sensor, a
magnetic resistance around the semiconductor sensor is decreased,
and the armature leakage magnetic flux is conversely concentrated
around the semiconductor sensor, resulting in a problematic
decrease in angle detection precision. The armature leakage
magnetic flux is generated also in a permanent magnet motor of a
non-consequent pole type, and thus reduction of the armature
leakage magnetic flux is a common object for permanent magnet
motors configured to detect the angle at the rotation shaft
end.
[0007] The present invention has been made in view of the
above-mentioned problem, and has an object to provide a permanent
magnet motor capable of reducing an armature leakage magnetic
flux.
Solution to Problem
[0008] In order to achieve the above-mentioned object, according to
one embodiment of the present invention, there is provided a
permanent magnet motor including an armature, a rotor, and an angle
detector. The armature includes an armature iron core and an
armature winding. The rotor includes a rotor iron core and a
permanent magnet. The angle detector includes a sensor magnet and a
semiconductor sensor. The rotor iron core including the permanent
magnet is fixed to a rotation shaft. The sensor magnet is
magnetized into two poles and is provided in an end portion of the
rotation shaft, and has the same rotation center as a rotation
center of the rotation shaft. The semiconductor sensor is opposed
to the sensor magnet in an extension direction of the rotation
shaft. The semiconductor sensor and the sensor magnet have a gap
formed therebetween. A plate member made of a magnetic substance is
provided between the semiconductor sensor and an end portion of the
armature iron core on the semiconductor sensor side.
Advantageous Effects of Invention
[0009] According to the permanent magnet motor of the present
invention, it is possible to reduce the armature leakage magnetic
flux.
BRIEF DESCRIPTION OF DRAWINGS
[0010] FIG. 1 is a diagram for illustrating a configuration of a
permanent magnet motor according to a first embodiment of the
present invention.
[0011] FIG. 2 is a diagram for illustrating a permanent magnet
motor as an explanatory example for the present invention.
[0012] FIG. 3 is a schematic diagram for illustrating a winding
arrangement of a 6-phase drive, 10-pole, and 12-slot type of the
first embodiment.
[0013] FIG. 4 is a diagram for illustrating armature leakage
magnetic fluxes formed by U1 and U2 as angles in the electrical
angle of the first embodiment.
[0014] FIG. 5 is a diagram for illustrating a state in which the
two armature leakage magnetic fluxes of FIG. 4 are superimposed on
the winding arrangement of FIG. 3.
[0015] FIG. 6 is a diagram for illustrating a configuration of a
permanent magnet motor according to a second embodiment of the
present invention.
[0016] FIG. 7 is a schematic diagram for illustrating a winding
arrangement of a 6-phase drive, 10-pole, and 12-slot type in a
third embodiment of the present invention.
[0017] FIG. 8 is a diagram for illustrating the armature leakage
magnetic fluxes formed by U1 and U2 as the angles in the electrical
angle of the third embodiment.
[0018] FIG. 9 is a diagram for illustrating the armature leakage
magnetic fluxes of FIG. 8 on the winding arrangement of FIG. 7.
DESCRIPTION OF EMBODIMENTS
[0019] A description is now given of embodiments of the present
invention with reference to the accompanying drawings. The same
reference symbol is used to denote the same or corresponding
component throughout the drawings.
First Embodiment
[0020] FIG. 1 is a diagram for illustrating a configuration of a
permanent magnet motor according to a first embodiment of the
present invention. The permanent magnet motor 1 is a multi-winding
multi-phase AC motor, and includes an armature 31, a rotor 33, and
an angle detector 35. The armature 31 includes an armature iron
core 14 and an armature winding 13. The rotor 33 includes a rotor
iron core 12 and permanent magnets 11. The angle detector 35
includes a sensor magnet 3 and a semiconductor sensor 5.
[0021] A holder 4 is fixed to one end of the rotation shaft 2 of
the permanent magnet motor 1. The sensor magnet 3 is supported by
the holder 4. The holder 4 and the sensor magnet 3 are supported by
the rotation shaft 2 so as to rotate integrally with the rotation
shaft 2.
[0022] The sensor magnet 3 is a cylindrical injection-molded
neodymium bonded magnet. The sensor magnet 3 is magnetized into two
poles. The sensor magnet 3 is integrally fixed to the rotation
shaft through press fit or the like via the holder 4 made of a
non-magnetic material, and is configured to rotate in
synchronization with the rotation of the rotation shaft. In other
words, the sensor magnet 3 is magnetized into two poles, is
provided to an end portion of the rotation shaft 2, and has the
same rotation center as that of the rotation shaft 2.
[0023] The semiconductor sensor 5 is arranged so as to be opposed
to a top surface of the sensor magnet 3 of FIG. 1. The
semiconductor sensor 5 is provided on the substrate 6. In other
words, the semiconductor sensor 5 is opposed to the sensor magnet 3
in a direction in which the rotation shaft 2 extends, and a gap is
formed between the semiconductor sensor 5 and the sensor magnet
3.
[0024] The semiconductor sensor 5 is a sensor of the magnetic
resistance type. Other electronic components, wiring patterns,
mounting holes constructing the angle detector only need to be
publicly-known forms, and are not shown in the diagram. The
semiconductor sensor 5 is configured to detect a rotation magnetic
field direction in a direction parallel with a plane having the
rotation shaft 2 as a perpendicular line, namely, a rotation
magnetic field direction 7, which is a direction parallel with the
substrate 6.
[0025] A rotor iron core 12 including the permanent magnets 11
corresponding to the number of poles is fixed to the rotation shaft
2. The rotor iron core 12 is configured to freely rotate in
synchronization with the rotation of the rotation shaft 2. The
permanent magnets 11 are arranged inside the rotor 33, that is, are
embedded in the rotor iron core 12. A magnetic gap is secured
between the rotor 33 and the armature 31.
[0026] The armature iron core 14 is arranged so as to be opposed to
an outer periphery of the rotor 33. A plurality of magnetic teeth
are provided in the armature iron core 14. The armature winding 13
constructed of a multi-phase winding group is wound on a plurality
of teeth, and is stored in slots between the teeth. An outer
periphery of the armature iron core 14 is mounted to an aluminum
frame 15. The rotation shaft 2 is held in an extension direction of
the rotation shaft of the frame 15 via a bearing 16 and a bearing
17. The bearing 16 is configured to rotatably hold the one end of
the rotation shaft 2, that is, the end portion of the rotation
shaft 2 in which the angle detector 35 is provided. The bearing 17
is configured to rotatably hold the other end of the rotation shaft
2. The other end of the rotation shaft 2 protrudes to an outside of
the frame 15. The frame 15 is separated into two components, which
are a section 15a in a cylindrical shape in contact with the
armature iron core 14 and a section 15b in a disc shape to which
the bearing 16 is mounted.
[0027] A plate member 21 made of a ferromagnetic substance is
provided between the semiconductor sensor 5 and an end portion on
the semiconductor sensor 5 side in the armature iron core 14. The
plate member 21 is constructed of a thin plate made of a magnetic
substance, which is a member separate from a section 15b of the
frame 15 positioned between the angle detector 35 and the armature
iron core 14 in an axial direction. The plate member 21 is in
contact with an end surface of the armature iron core 14 directly
or via a magnetic substance. In an example illustrated in FIG. 1,
the plate member 21 is directly in contact with an outer most
portion in a radial direction of the end surface on the
semiconductor sensor 5 side.
[0028] The plate member 21 includes a first section 21a extending
in the axial direction, and a second section 21b extending in an
imaginary plane having a perpendicular line along the axial
direction. The first section 21a extends from the armature iron
core 14 in the axial direction so as to be away from the armature
iron core 14. The second section 21b radially extends from a
portion mostly separated from the armature iron core 14 in the
first section 21a toward a radial inside. The plate member 21 is
configured to extend in an L shape viewed on a cross section of
FIG. 1. Moreover, in other words, the plate member 21 is configured
to cover the end surface of the armature iron core 14 on the
semiconductor sensor 5 side from a radially outer portion to a
radially inner portion.
[0029] A description is now given of an action of the
above-mentioned permanent magnet motor of the first embodiment.
FIG. 2 is a diagram for illustrating a permanent magnet motor as an
explanatory example for the present invention. In the permanent
magnet motor of FIG. 2, the plate member 21 of the first embodiment
is not provided. Therefore, as illustrated in FIG. 2, there poses
such a problem that an armature leakage magnetic flux C flows from
an armature outer periphery, penetrates the semiconductor sensor
horizontally in a plane perpendicular to the rotation shaft, and
flows into the armature outer periphery on the opposite side,
resulting in a problematic decrease in angle detection precision.
In contrast, in the first embodiment, the plate member 21 made of
the magnetic substance is arranged so as to be in contact with the
axial end of the armature iron core 14, and has such a shape as to
cover the armature iron core 14 from the radially outer side to the
radially inner side of the armature iron core 14. Therefore, an
armature leakage magnetic flux A does not flow from the outer
periphery of the armature 31 into the outer periphery of the
armature 31 on the opposite side in such a manner as to cross the
semiconductor sensor 5, but flows from the outer peripheral side of
the armature 31 into the outer periphery of the armature 31 on the
opposite side in such a manner as to route through the plate member
21. In other words, the armature leakage magnetic flux A is guided
so as to bypass the semiconductor sensor 5. Therefore, a magnetic
path, which is formed of the magnetic substance and guides the
armature leakage magnetic flux from the armature outer periphery to
the armature outer periphery on the opposite side, is added to the
permanent magnet motor 1.
[0030] A description is now given of a winding arrangement of the
first embodiment. FIG. 3 is a schematic diagram for illustrating a
winding arrangement of a 6-phase drive, 10-pole, and 12-slot type
of the first embodiment. Windings for 6 phases of U1, V1, W1, U2,
V2, and W2 for driving each set of two phases through a current in
the same phase are wound on respective 12 slots of the armature 31.
U1+ and U1- mean that winding directions are opposite to each
other. Currents in the same phase are supplied to the two phases in
each of sets of U1 and U2, V1 and V2, and W1 and W2.
[0031] FIG. 4 is a diagram for illustrating armature leakage
magnetic fluxes formed by U1 and U2 as angles in the electrical
angle of the first embodiment. In FIG. 4, directions of the
armature leakage magnetic fluxes formed by the 2 phases having the
same current supply phase flowing from the armature outer periphery
to the armature outer periphery on the opposite side across the
rotation shaft are indicated as the angles in the electrical
angle.
[0032] The magnetic fluxes are an armature leakage magnetic flux
flowing from U1+ to U2-, and an armature leakage magnetic flux
flowing from U2+ to U1-.
[0033] FIG. 5 is a diagram for illustrating a state in which the
two armature leakage magnetic fluxes of FIG. 4 are superimposed on
the winding arrangement of FIG. 3. In FIG. 5, a component B
obtained by composing the two armature leakage magnetic fluxes is
illustrated. In other words, the composed component B is the
armature leakage magnetic flux indicated as A of FIG. 1 or C of
FIG. 2 formed by the two phases U1 and U2, and rotates once while a
magnitude thereof changes over one cycle in the electrical angle as
the current supply phases change. When the armature leakage
magnetic flux crosses the semiconductor sensor in the direction of
detecting the magnetic field of the sensor magnet, an angle
difference between the magnetic field of the sensor magnet and the
armature leakage magnetic flux corresponds to an error in the
detected angle.
Second Embodiment
[0034] A description is now given of a second embodiment of the
present invention. In the second embodiment, apart except for the
one described below is the same as that of the first embodiment.
FIG. 6 is a diagram for illustrating a configuration of a permanent
magnet motor according to a second embodiment of the present
invention. In the second embodiment, the section 215a in a
cylindrical shape in contact with the armature iron core in the
frame is formed of a magnetic substance. As compared with the
aluminum cylindrical frame in the first embodiment, the weight
increases, but sufficient strength is provided while a plate
thickness is decreased, and thus noise and vibration during drive
of the motor can be decreased for a small outer diameter. Moreover,
in the second embodiment, an aluminum frame section 215b in a disc
shape, to which the bearing is mounted, can advantageously be used
as a heatsink by arranging an inverter on a rear surface of the
frame.
[0035] When the plate member 21 is not provided, the cylindrical
frame made of the magnetic substance is in contact with the
armature iron core. Thus, as indicated by the dotted line, the
armature leakage magnetic flux flows from the armature outer
periphery, routes through a radially inner portion of the frame,
crosses the rotation shaft, routes through the radially inner
portion of the frame on the opposite side, flows to the armature
outer periphery on the opposite side, resulting in a decrease in
angle detection precision. However, in the second embodiment, the
plate member 21 is provided, and the plate member 21 made of the
magnetic substance is arranged in contact with the cylindrical
frame independently of the aluminum frame portion having the disc
shape to which the bearing is mounted. Therefore, the armature
leakage magnetic flux can be guided to the magnetic substance to
bypass the semiconductor sensor. Thus, the effect of increasing the
angle detection precision is provided.
[0036] The above-mentioned first and second embodiments are
described in the case of the 6-phase drive, but it is apparent that
the effect of increasing the angle detection precision can also be
provided for a general permanent magnet motor of a three-phase
drive, 10-pole, and 12-slot type in which U1 and U2, V1 and V2, and
W1 and W2 are respectively configured as parallel circuits.
Third Embodiment
[0037] A description is now given of a third embodiment of the
present invention. In the third embodiment, a part except for the
one described below is the same as those of the first and second
embodiments. FIG. 7 is a schematic diagram for illustrating a
winding arrangement of the 6-phase drive, 10-pole, and 12-slot type
of the third embodiment. The third embodiment has a winding
arrangement of the 6-phase drive, 10-pole, and 12-slot type in
which the two phases of the above-mentioned first embodiment are
driven through currents having the phase difference of 30
degrees.
[0038] The windings of the 6 phases of U1, V1, W1, U2, V2, and W2
are wound on respective 12 slots. U1+ and U1- mean that winding
directions are opposite to each other. The currents having the
phase difference of 30 degrees are supplied to the two phases in
each of the sets of U1 and U2, V1 and V2, and W1 and W2, which is
common in a double three-phase motor configured to cancel a torque
ripple of 6f through the phase difference of 30 degrees.
[0039] FIG. 8 is a diagram for illustrating the armature leakage
magnetic fluxes formed by U1 and U2 as the angles in the electric
angle of the third embodiment. In FIG. 8, directions of the
armature leakage magnetic fluxes, which are formed by the 2 phases
different in the current supply phases by 30 degrees flowing from
the armature outer periphery to the armature outer periphery on the
opposite side across the rotation shaft, are indicated as the
angles in the electrical angle. In other words, the magnetic fluxes
are an armature leakage magnetic flux flowing from U1+ to U2-, and
an armature leakage magnetic flux flowing from U2+ to U1-. The
phases of the angles in the electrical angle of the two armature
leakage magnetic fluxes are the same.
[0040] FIG. 9 is a diagram for illustrating the armature leakage
magnetic fluxes of FIG. 8 on the winding arrangement of FIG. 7. U1+
and U2- are arranged so as to form 30 degrees in the mechanical
angle, and thus U1+ and U2- form an angle of 150 degrees in the
electrical angle and further form an angle of 180 degrees due to
the phase difference of 30 degrees between the currents. However,
U1+ and U2- have the winding directions opposite to each other, and
thus the phase difference between the two armature leakage magnetic
fluxes is 0 degree in the electrical angle, that is, U1+ and U2-
have the same phase. As illustrated in FIG. 9, the leakage magnetic
fluxes are in the directions canceling each other in the mechanical
angle in consideration of the winding directions. From an opposite
view point, this is equivalent to a fact that U1 and U2 have the
same angles when the angles of the supply currents have the phase
difference of 30 degrees, but the directions are opposite to each
other due to the winding arrangement of U1 and U2. Thus, in the
normal 6-phase drive, the armature leakage magnetic fluxes cancel
one another, and are thus zero. However, the third embodiment
corresponds to a case where the current supply to U1, V1, and W1 is
shut off, and the motor is driven only through U2, V2, and W2. This
corresponds to a case where two inverters supply currents to the
respective groups, and when the current supply to one group is
turned off due to abnormality of the inverter or the winding, the
drive by the other group is continued. On this occasion, the
armature leakage magnetic fluxes do not cancel each other as
illustrated in FIG. 9, and it is understood that the armature
leakage magnetic fluxes cross the semiconductor sensor, and the
angle detection error increases. Even in this case, the armature
leakage magnetic fluxes crossing the semiconductor sensor can be
guided for the bypassing by arranging the plate member 21 made of
the magnetic substance of the first embodiment or the second
embodiment, thereby providing the effect of increasing the angle
detection precision.
[0041] In any of the first to third embodiments, the present
invention can embody a permanent magnet motor of a 10-pole and
12-slot type in which the windings of the two phases of each of the
sets of U1 and U2, V1 and V2, and W1 and W2 out of the six phases
have the same number of turns, and are stored in the same slot.
Also in this case, it is apparent that the effect of increasing the
angle detection precision can be provided.
[0042] A specific description has been given of the content of the
present invention with reference to the preferred embodiments, but
it is apparent that a person skilled in the art can employ various
modified forms based on the basic technical ideas and the teaching
of the present invention.
[0043] The permanent magnet motor of the present invention is not
limited to the 10-poles and 12-slot type magnet motor, and may be
embodied, for example, as a 14-pole and 12-slot type magnet motor,
or a 14-pole and 18-slot type magnet motor.
[0044] Regarding the above-mentioned respective embodiments, the
present invention includes a combination of a part or an entirety
of the configurations of one or more of the embodiments and other
embodiments.
REFERENCE SIGNS LIST
[0045] 1 permanent magnet motor, 2 rotation shaft, 3 sensor magnet,
5 semiconductor sensor, 11 permanent magnet, 12 rotor iron core, 13
armature winding, 14 armature iron core, 21 plate member, 31
armature, 33 rotor, 35 angle detector.
* * * * *